Pass over HDR10+ and Dolby Vision information?

[quietvoid]

Originally Posted by Boulder

So this would be just a case of running dovi_tool -m 2 -c extract-rpu to get the RPU file for the x265 encoding part?

Yes, normally.

[Balling]

You can just use ffmpeg -i file.mp4 -strict unofficial file.mp4

You can also change mp4 brand with -brand.

That will preserve DoVi sidedata and will play on LG TVs, triggering Dolby Vision icon.

DoVi support commit needed: https://github.com/FFmpeg/FFmpeg/com...d4f5f95b7bf8f3

[Nico8583]

Originally Posted by quietvoid

Yes it's normal, only profile 7 requires the EL (enhancement layer), which is a separate video track.

Hi,
Another question about that.
MakeMKV can make a single track profile 7 with BL+EL+RPU but profile 7 is a separate tracks ?! How can it do that ? Is it a real supported format ?Thanks !

[SeeMoreDigital]

Originally Posted by Nico8583

MakeMKV can make a single track profile 7 with BL+EL+RPU but profile 7 is a separate tracks ?! How can it do that ? Is it a real supported format ?Thanks !

Such muxes no longer conform to 'Profile 7'...

[quietvoid]

Originally Posted by Nico8583

Hi,
Another question about that.
MakeMKV can make a single track profile 7 with BL+EL+RPU but profile 7 is a separate tracks ?! How can it do that ? Is it a real supported format ?Thanks !

It just adds the second track NALUs as type 63 (regular HEVC NALUs) and type 62 (RPU). All of this is added after every slice in the BL (HDR10 stream).

Originally Posted by SeeMoreDigital

Such muxes no longer conform to 'Profile 7'...

Not quite, it is still conformant as a "Combo Dolby Vision stream in a single Dolby Vision PID".

Originally Posted by Dolby® Vision Streams Within the MPEG-2 Transport Stream Format

Combo Dolby Vision stream containing the BL, EL and RPU substreams
or BL and RPU substreams shall be carried as a regular AVC/HEVC
stream using the T-STD model.

[SeeMoreDigital]

Originally Posted by quietvoid

Not quite, it is still conformant as a "Combo Dolby Vision stream in a single Dolby Vision PID".

Surely our friends over at Dolby have created a new profile number for such muxes

[quietvoid]

Another profile isn't necessary, this is just another way to carry the information.

[SeeMoreDigital]

Originally Posted by quietvoid

Another profile isn't necessary, this is just another way to carry the information.

That does surprise me. It's not like Dolby to make things simple!

[Nico8583]

Thanks for these informations. So what is the better way to keep DoVi ? Profile 7 like MakeMKV ? And do you think it could be possible to add this way to DoVi tool ? Thanks.

[quietvoid]

Originally Posted by Nico8583

Thanks for these informations. So what is the better way to keep DoVi ? Profile 7 like MakeMKV ? And do you think it could be possible to add this way to DoVi tool ? Thanks.

MakeMKV would still be the simplest way, since it supports both discs and existing dual track MKVs.
Maybe one day dovi_tool can mux both tracks, but it would probably only support the raw streams as input.

[SeeMoreDigital]

Originally Posted by Nico8583

Thanks for these informations. So what is the better way to keep DoVi ? Profile 7 like MakeMKV ? And do you think it could be possible to add this way to DoVi tool ? Thanks.

What's the make/model of your playback device and TV?

[Nico8583]

@quietvoid : Thanks, I would like to make an automated process so MakeMKV is not the best way for me. Is there a quality or compatibility difference between MakeMKV output (BL + EL + RPU in a single track) and dovi_tool (profile 7 BL + EL to single track profile 8.1) from an UHD BD source ?
Edit : The purpose is to encode to x265.
@SeeMoreDigital : Currently a Samsung QLED so without DoVi support but I plan to buy a LG or Sony later so I would like to create my MKV with HDR10+ and DoVi support. My playback device is a Nvidia Shield 2019 Pro currently.

[quietvoid]

Originally Posted by Nico8583

@quietvoid : Thanks, I would like to make an automated process so MakeMKV is not the best way for me.

MakeMKV can be used in CLI, something like this:

makemkvcon mkv file:/path/to/disc 1

Originally Posted by Nico8583

Is there a quality or compatibility difference between MakeMKV output (BL + EL + RPU in a single track) and dovi_tool (profile 7 BL + EL to single track profile 8.1) from an UHD BD source ?
Edit : The purpose is to encode to x265.

If you plan on encoding with x265, I'm not sure how smooth the process will be if you want to keep the EL.
Otheriwse, the RPU can be used with x265 directly.

In the end, quality depends on the final playback. Only UHD disc players support profile 7 correctly, anything else is going to be the equivalent of profile 8.1.
Because the EL is not used at all. So you should keep that in mind.

[Nico8583]

Thanks quietvoid again
I would like to not use MakeMKV because while is in a beta state it's free but when the final version will be released I don't know. So I just found yusesope's tool (last GAMMA version) and I can read it can do the same. So I will try it as soon as possible.
The BL+EL+RPU mux into a single track (like yusesope or MakeMKV do) would be a great improvment in dovi_tool

[Nico8583]

I just looked more at dovi_tool usage but the source needs to be a single track dual layer ? So a track from MakeMKV ?

[quietvoid]

Originally Posted by Nico8583

I just looked more at dovi_tool usage but the source needs to be a single track dual layer ? So a track from MakeMKV ?

For what command?
The RPU, for UHD sources, is usually in the 2nd video track, which you can get by demuxing the m2ts.
That video can be used to extract the RPU.

[Nico8583]

To convert an UHD Blu Ray to profile 8.1. It supports only M2TS as input ? What about if a playlist contains multiple M2TS ?
Same question to extract RPU from an UHD Blu Ray in order to encode with x265 ? And do you if it's possible to encode while keeping both HDR10+ and DoVi metadata ? Thanks.

[quietvoid]

Originally Posted by Nico8583

To convert an UHD Blu Ray to profile 8.1. It supports only M2TS as input ?

No, it supports any container for HEVC but you need to use ffmpeg to pipe the data, there are examples in the readme.

Originally Posted by Nico8583

What about if a playlist contains multiple M2TS ?

You need to merge them into a single file first.

Originally Posted by Nico8583

Same question to extract RPU from an UHD Blu Ray in order to encode with x265 ?

Same principle as previous, you just need to mux the whole title and then use ffmpeg with dovi_tool.

Originally Posted by Nico8583

And do you if it's possible to encode while keeping both HDR10+ and DoVi metadata ? Thanks.

Yes, I explained this already here: https://forum.doom9.org/showthread.p...41#post1934341

[Nico8583]

Thanks again for all your answers.
So if I want to extract RPU from an UHD BD (FEL or MEL so 2 tracks) to use it with x265, I don't need to use MakeMKV but I can use "ffmpeg -i input.wantiwant -c:v copy -vbsf hevc_mp4toannexb -f hevc - | dovi_tool -m 2 extract-rpu - -o RPU.bin" ?
Because the doc says "Extracts Dolby Vision RPU from an single track dual layer encoded file."
Thanks !

[quietvoid]

Originally Posted by Nico8583

Thanks again for all your answers.
So if I want to extract RPU from an UHD BD (FEL or MEL so 2 tracks) to use it with x265, I don't need to use MakeMKV but I can use "ffmpeg -i input.wantiwant -c:v copy -vbsf hevc_mp4toannexb -f hevc - | dovi_tool -m 2 extract-rpu - -o RPU.bin" ?
Because the doc says "Extracts Dolby Vision RPU from an single track dual layer encoded file."
Thanks !

Yes, you explicitly need to demux/pipe the video track which contains the RPU, so the EL.
If it's a single track containing both (such as what MakeMKV produces), then there's only one track so the examples work fine.

I will fix the documentation.